40131220321 has 4 divisors (see below), whose sum is σ = 40396990144. Its totient is φ = 39865450500.

The previous prime is 40131220313. The next prime is 40131220331. The reversal of 40131220321 is 12302213104.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40131220321 - 2³ = 40131220313 is a prime.

It is a super-2 number, since 2×40131220321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40131220331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132884685 + ... + 132884986.

It is an arithmetic number, because the mean of its divisors is an integer number (10099247536).

Almost surely, 2^40131220321 is an apocalyptic number.

It is an amenable number.

40131220321 is a deficient number, since it is larger than the sum of its proper divisors (265769823).

40131220321 is a wasteful number, since it uses less digits than its factorization.

40131220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265769822.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 40131220321 its reverse (12302213104), we get a palindrome (52433433425).

The spelling of 40131220321 in words is "forty billion, one hundred thirty-one million, two hundred twenty thousand, three hundred twenty-one".